[INFO] cloning repository https://github.com/coder-001w/rust_threadpool
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/coder-001w/rust_threadpool" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcoder-001w%2Frust_threadpool", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcoder-001w%2Frust_threadpool'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 311f7472e10d60b1753eac53f873d4b93c17dc98
[INFO] checking coder-001w/rust_threadpool against master#0fb279be1d96464c69209053ef0f97ad63088cda for pr-143857
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcoder-001w%2Frust_threadpool" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/coder-001w/rust_threadpool
[INFO] finished tweaking git repo https://github.com/coder-001w/rust_threadpool
[INFO] tweaked toml for git repo https://github.com/coder-001w/rust_threadpool written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/coder-001w/rust_threadpool on toolchain 0fb279be1d96464c69209053ef0f97ad63088cda
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0fb279be1d96464c69209053ef0f97ad63088cda" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/coder-001w/rust_threadpool already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0fb279be1d96464c69209053ef0f97ad63088cda" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+0fb279be1d96464c69209053ef0f97ad63088cda" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b906f4cf20b9becb21d93c015f904c9b6ef52fa40a0ac53ee32e8ae49406fd37
[INFO] running `Command { std: "docker" "start" "-a" "b906f4cf20b9becb21d93c015f904c9b6ef52fa40a0ac53ee32e8ae49406fd37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b906f4cf20b9becb21d93c015f904c9b6ef52fa40a0ac53ee32e8ae49406fd37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b906f4cf20b9becb21d93c015f904c9b6ef52fa40a0ac53ee32e8ae49406fd37", kill_on_drop: false }`
[INFO] [stdout] b906f4cf20b9becb21d93c015f904c9b6ef52fa40a0ac53ee32e8ae49406fd37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+0fb279be1d96464c69209053ef0f97ad63088cda" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85300009348e8e46de10f5c6335606411d5560b8ea20a031c6ae6275ae795f97
[INFO] running `Command { std: "docker" "start" "-a" "85300009348e8e46de10f5c6335606411d5560b8ea20a031c6ae6275ae795f97", kill_on_drop: false }`
[INFO] [stderr]     Checking thread_pool v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Receiver`
[INFO] [stdout]  --> src/lib.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     sync::mpsc::{self, Receiver},
[INFO] [stdout]   |                        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Receiver`
[INFO] [stdout]  --> src/lib.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     sync::mpsc::{self, Receiver},
[INFO] [stdout]   |                        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]   --> src/lib.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Worker {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 12 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 13 |     thread: thread::JoinHandle<()>, // 储存了使用一个空闭包创建的 JoinHandle<()>。
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]   --> src/lib.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct ThreadPool {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 30 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]   --> src/lib.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Worker {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 12 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 13 |     thread: thread::JoinHandle<()>, // 储存了使用一个空闭包创建的 JoinHandle<()>。
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]   --> src/lib.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct ThreadPool {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 30 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "85300009348e8e46de10f5c6335606411d5560b8ea20a031c6ae6275ae795f97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85300009348e8e46de10f5c6335606411d5560b8ea20a031c6ae6275ae795f97", kill_on_drop: false }`
[INFO] [stdout] 85300009348e8e46de10f5c6335606411d5560b8ea20a031c6ae6275ae795f97